Improvement in chronometric locks



UNITED' STaTns PATENT Genion.

`nv:PR'oven/laurier koi-lnonownarulc: LOCKS. l

Specification forming poi-t of Letters Patent No. 8,603, dated DecemberLVS, 185i.

` To all whom t may concern:

Be it known that I,.WILLIAM L. Bass, 'of Boston, in the county ofASntfollt and Stute of Massachusetts, have invented certain new anduseful Improvements in the Manner of Fastening the Doors f Safes,Bank-Vaults, Sie.; and that the following description, taken inconnection with the accompanying drawings, hereinafter referred to,formsa full and exact specification of the same, wherein I have set forth thenature and prin'ciplesof iny'said improvements, by which my inventionvmay be distinguished from others of a similar class, together with suchparts as I claim and desire to have secured to me by Letters Patent.

The figures of the accompanying plates of drawings represent myimprovements.

In Plate 1,Figu re1 isa side eleva-tion of my apparatus with the frontplate of the clockwork and the pendulum removed. In Plate 2, Fig. 2 .isa front eleva-tion of the door, Sac., showin g the manner of moving thebolt. Figs. 3, 4, and 5 are detail views of the lifting apparatus; andFigs. 6 and '7 are detail views, which will be hereinafter referred to.

The peculiar features of my invention con.

-sist in certain additions' to the known machinery for relieving thepawl from a bolt, by means of machinery inside of the door, and actuatedby a time-piece in the same locality, which additions consist in apeculiar arrange ment of mechanism, hereinafterl referred to andexplained, which permits the door to be opened from the outside in casethe clock should stop from 'any cause, while the door cannot be openedby the same arrangement while the clock-work is in motion.. ,A

c c a in the drawings' is the door, which, it will be observed,hasnothing on the outside but the knob or handle b. c c is the lock orframe-work, of iron, on the inside of the door, in which is the bolt e,moved in and out by means of a pinion, f, (shown by ,dotted lines in,Fig. 2, Plate 2,) attached to the' shaft of the knob b, and playing in ageared rack, g.

The bolt c has a notch in it, into which tits the'pawl or projection hof the lever 11.13(secured on theinsde of the partition, near the door,}which lever swings freely on a fulcrum at la. In the end of the weightfi is la'hook, l, which iits over a projecting arm, on., 011 the hingedslotted plate n, (shown more particuliirl ing against the thebolt, aswill readily be understood by inspection ofthe drawings. l

should stop from any disarrangcment of its part-s the door could not beopenedI by the above mechanism, which would prove a sethis contingency,l lia-ve contrived aliftin gapparatus,'by which the lever h can belifted very slowly from theybolt from the outside when the clock isstopped, but which lever cannot be raised when the clock is in motion,

thus 'proving'an eflicient bar to bnrglars or ,other malicious persons.

The lifting apparatus above referred to is representedl in Figs. 3, 4,and v5, Plate 2, of which Fig. 3 is a side elevation, Fig. 4, a sectiontaken in the` plane of the line A B, Fig. l, Plate l, shcwin g thehorizontal'screw-shaft, partition, &c., and Fig. 5 is a section taken inthe plane! of the line B C of the said Fig. 1, showing the' verticallifting-screw, 810. v

A A A is a frame of Vmetal or other suitable material fastened tothepartition, through which frame is inserted vertically, a fine threadedscrew, B B, on which pla-ys a burrwheel, C C, having shoulders whichbear against the rightangular projections of said frame A A A. Thisburr-wheel is turned by an endless screwon the horizontal shaft D l),which passes through the partition, as shown in Fig. 4. Theturning ofthe nut G C raises the vertical screw B B, to the lower end of which isfastened a chain or cord, E E, which runs on a pulley, F, attached tothe lever la. c', and passes up to a forked lever, G, Fig. "7, Y'Plate2, the other end of said chain passing over a pulley, H, and ending in aWeight, I, as represented in the drawings. The forked lever Gr turns ona fulcrum-at K, and has snsthe arm m from the hook l and -the pawl fromBut-it will be evident that in case the clock rions'inconvenience. Inorder to provide for Y another.A

pnded in its 'forked end a' swinging loop, L, there being in the ends-of the fork pins or stops to lprevent the loop 'from swinging in beyonda right angle with the lever G.' The loop hangs under a ratchet-wheel,M, placed on the shaft of the third wheel t f By applying `a thumb nntorcrank tothe endless-screw shaft D l). on the outside'of the partition,the vertical screw4 B B will raise the cord' E E, and consequently the.lever In,

from the holt, when the clock isstopped, -the loop Lin thel forked leverG catching in the teeth of the wheel M, and thereby holding' the leverGr firmly in itsv place. The ratchet-- wheel cannot revolve whenthe'clock is stopped,

i asthe wheels are all held rlnly in'tlieir places by means' of themotionless pendulumin the guide; but Whenthe. clock -is in motion, andalso the ratchet-wheel M, lthe loop, instead of catching in the teeth of-said wheel, will drop from one tooth to another, becausetherat'chet-wheel yrevolves in the saine direction as the loop israised, and not against it, and the yratchet-ve'hee'l revolves muchfaster than the 'vertical screwcan be raised by means ot' the -cr'a-nkon the endless-,screw shaft. Thus, if

the loop is' raised by.the lifting-screw while the Works are in motion,the ratchet-teeth will continuallypass the' bend of the loop, said loop.as aforesaid, dropping from one toot-h to In a Working-machine Vit. isbetter to fasten the upper end ot' fthe c ord to the top of the screw BB, instead of to the small weight I,

as said weight causes some strain on the lever-l 11, t', though notenough to raise thesalne. `When it is fastened to-.the top ofthe screw,

the screw Willv give outl the cord at the top,

the forked lever Gr yielding at the same time,

said cord being taken up in the same propor- -endless-screw shaft asthere are burrs or cuts on the Wheel, in order torais'e-theliftingrlscrew the thickness of one thread.

It may be observed that the sweep of the outer end of the forked lever,where the cord isfastened, must be as long` or longer than the liftofthe vertical "screw, so that the said without causing .any strain onthe forked lever; lotherwise the pawl might be lifted from the notch inthe bolt.

Having thus described my improv shall state my claim 'as follows:

What Irclaim as my invention, and'desire e to have secured to me byLetters Patent, is The manner of disen'gaging the droplever thepartition when the clock is stopped, and

the clock is in motion by means of the lifting` screws, in combinationwith the forked lever,

in the manner above described.

WM. L. BASS.; Witnesses:

JOSEPH GAvn'rT, LznAtLINcoLN.

tion at the bottom of the vertical screw, and;

Wouldtake the same number of turns of the y screw can be raised orlowered its f ull length` ement, l

from the notclr of the bolt from the outside of l 'preventing the samefrom being effected when i swingingloop, and ratchet-wheel,substantially Y

